Install Optional Outside Air Kit

The AKU3 Outside Air Kit can be installed to bring com- bustion air to the heated room air. The air that is drawn into the heated room air from outside the home or un- heated area helps relieve the pressure in the home. The duct termination should be located so it is exposed to an out-of-doors opening at least 100 square inches. If the duct termination must be located in a crawl space or basement, be sure the termination area has 100 square inches of ventilation opening to outside air.

The duct termination must be located so it does not compete for air ﬂow with exhaust fans, gas vent hoods or other air consuming devices or appliances. It must not be obstructed by rafters, insulation materials or other obstructions. The less restrictive the air supply, the better the outside air kits will perform.

It is good practice to protect your hands and eyes during installation by wearing work gloves and safety glasses.

CAUTION: Do not install termination into a garage or other area that could contain ﬂammable liquids or fumes, or into an attic space.

Installation Instructions

Determine the location of the ﬁreplace as described in the ﬁreplace installation manual. Then plan location of the duct termination and the route of the duct run between the ﬁreplace and the duct termination.

Duct run must be limited to a maximum distance of 40’ (12.2m) from the ﬁreplace pipe collar to duct termina- tion. This will provide the least restriction to air ﬂow. No more than four (4) 90° elbows can be used. Duct run may be horizontal, vertical, inclined or any combina- tion of these. (Fig. 12) You are now ready to install the Outside Air Kit.

1.Remove the screws retaining the outside air cover- plate, if provided. (Located on the left side of front open units, on backside of multisided units.) Discard coverplate. (Fig. 13)

2.Secure the inlet collar assembly to the outer casing with four screws (not provided). (Fig. 14)

3.Slide the duct over the collar and attach the duct to the collar using the plastic tie straps or three (3) screws (screws not provided). Continue attaching the ducting together using three (3) screws at each joint until you have installed sufﬁcient duct to arrive at your duct termination locations.

4.At the termination end, install the duct termination. This should be installed from the outside of the home. Cut a hole in the desired location approxi- mately 4¹⁄₂” (114mm) in diameter, caulk around the hole, and slide the termination through the opening from outside the home. The termination/rain cap

UVDR Series Unvented Gas Fireplaces

should be caulked around its perimeter to assure a tight seal. The rain cap opening should be positioned downward. (Fig. 15)

The Outside Air Kit is now installed and ready for use.

Sofﬁt Termination

		Attic
	Duct	Ceiling
	Termination	Ceiling
	Termination

40’ Max.

Duct Run

Duct

Exterior Wall Termination

Exterior Wall

40’ Max. Duct Run

Rain Cap

Duct Termination	Duct

FP1060

Fig. 12 Typical outside air installations.

Cover Plate

KT143

Fig. 13 Remove outside air cover plate and discard, retain screws.

20007469

UVDR36C, UVDR42C specifications

CFM Corporation is a leading name in the world of efficient ventilation and air quality management, and its UVDR series, specifically the UVDR36C and UVDR42C models, stands out for their innovative features and advanced technologies. Designed for residential and commercial applications, these units are engineered to enhance air quality while ensuring energy efficiency.

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